I think it's a fruit related to size and dimensions too.. He has some sort of size barrier within wich everything is smaller and can somehow do as if parts of his body were linked to somewhere else.
I wonder how large his crew really is, and if he can let them stay thousands of kms away and link their place to a part of his body at will so they can help him. If he can do something like this it also means he can make anything coming at him teleport to another place O.o

It's Oda, I'd doubt he'd go with something so elaborate. And since Franky, and then the Pacifista people think Cyborgs are springing up everywhere.
I think it's just some, weird typical Oda, fruit that actually somehow made his body a home for a battle fortress, that will defend and fight for him when needed.

Well, since I'm gonna join Luffy and the gang, mizu mizu no mi or kaze kaze no mi will be good. I can manipulate wind and water though. but if I have to choose between them, the best will be wind lol Air is everywhere and not hard to find even in a desert like during the battle with crocodile lol

I'll go for something like energy fruit, gives you the power to make thing work without power supply/whatever it consume to work and prevent your body from sleeping or feeling weak(always at 100% XD). I was thinking It would be a good power for an engineer.